PURPOSE:To improve the traveling performance and durability without deteriorating the electromagnetic transducing characteristics by roughening one of two surfaces of a biaxially stretched laminated film of a prescribed polyester and flattening the other so that each of the resulting rough and flat surfaces contains projections having a prescribed distribution. CONSTITUTION:A biaxially strentched laminated film is made of aromatic polyester contg. aromatic dicarboxylic acid as the principal acid component and aliphatic glycol as the principal glycol component. One of two surfaces of the film contg. inert particles has 0.010-0.025mum surface roughness and the projections has a distribution curve which does not intersect a straight line represented by a formula log10y=-9.8x+4.4 (where x is log2y>1.3. A curve in a part larger than the maximum value of the distribution curve is within the range of log10y>=-18x+3.7. The other of two surfaces of the film is a flat surface having <0.10mum surface roughness. The height (x) in a part larger than the maximum value of the distribution curve of the projections intersects a curve represented by a formula log10y=-1.8x+3.7. The height (x) is <=0.13mum.

Magnetic recording medium

Composite materials are disclosed comprising a continuous matrix with composite reinforcements therein. The composite materials may include a continuous metal, metal alloy or intermetallic matrix with intermetallic matrix composite reinforcements dispersed therein. Suitable metals for the continuous matrix include Al, Ti, Cu and Fe, and alloys and intermetallics thereof. The composite reinforcements comprise ceramic particles dispersed in a continuous intermetallic matrix. Suitable intermetallics include alumnides of Ti, Cu, Ni, Mg and Fe, while suitable ceramics include refractory metal borides, carbides, nitrides, sulicides and sulfides. In one embodiment, the ceramic particles are formed in-situ within the intermetallic matrix of the composite reinforcements. The composite materials are produced by powder metallurgical techniques wherein powders of the continuous matrix component and powders of the composite reinforcement are blended and consolidated. The composite materials may be subjected to deformation processes such as extruding, rolling and forging during or after the consolidation step to provide materials with improved properties.

Method of producing composite materials including metallic matrix composite reinforcements

Composite materials are disclosed comprising a continuous matrix with composite reinforcements therein. The composite materials may include a continuous metal, metal alloy or intermetallic matrix with intermetallic matrix composite reinforcements dispersed therein. Suitable metals for the continuous matrix include Al, Ti, Cu and Fe, and alloys and intermetallics thereof. The composite reinforcements comprise ceramic particles dispersed in a continuous intermetallic matrix. Suitable intermetallics include aluminides of Ti, Cu, Ni, Mg and Fe, while suitable ceramics include refractory metal borides, carbides, nitrides, silicides and sulfides. In one embodiment, the ceramic particles are formed in-situ within the intermetallic matrix of the composite reinforcements. The composite materials are produced by powder metallurgical techniques wherein powders of the continuous matrix component and powders of the composite reinforcement are blended and consolidated. The composite materials may be subjected to deformation processes such as extruding, rolling and forging during or after the consolidation step to provide materials with improved properties.

Composite materials including metallic matrix composite reinforcements

A heat resistant and wear resistant iron-base sintered alloy to be used as the material of a valve seat and a valve face of an engine valve and a waste gate valve of a turbocharger for an internal combustion engine. The iron-base sintered alloy consists essentially of at least one of molybdenum and tungsten, ranging from 3 to 25% by weight, chromium ranging from 1 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 2.5% by weight, boron ranging from 0.5 to 2.0% by weight, intermetallic compound of TiAl ranging from 0.3 to 20% by weight, and balance including iron and impurities. In the sintered alloy, carbide, boride and/or carbide boride and TiAl are uniformly dispersed in the matrix, thereby strengthening grain boundary.

Heat resistant and wear resistant iron-based sintered alloy

A mixture of two powdered alloys of the M, Cr, Al type, M being Co and/or Ni, is disclosed, in one form, for use in providing an abradable surface of an article and is characterized by the substantial absence of B. The first alloy has substantially no Si and has a higher melting range than that of the second alloy. The second alloy has substantially no Y and consists essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr, with the balance M and incidiental impurities. The total mixture composition consists essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities.

Abradable article and powder and method for making

A nickel-base sintered alloy which comprises: being manufactured from a reduced powder by the conventional powder metallurgy process with said reduced powder as a material powder, said reduced powder being prepared by simultaneously reducing a mixed powder consisting of powders of oxides of elements constituting said sintered alloy with a carbon powder added and mixed therein, and said reduced powder consisting of powders of said constituent elements and powders of carbides thereof; and consisting essentially of, in weight percentage: ______________________________________ chromium from 10.0 to 35.0 %tungsten from 0.5 to 15.0 %cobalt from 0.2 to 12.0 %molybdenum from 0.1 to 20.0 %iron from 0.1 to 20.0 %titanium from 0.05 to 2.00 %silicon from 0.05 to 1.50 %manganese from 0.05 to 1.00 %carbon from 0.1 to 3.5 %______________________________________ And the balance nickel and incidental impurities. The above-mentioned nickel-base sintered alloy, also containing, in weight percentage, from 0.05 to 1.00% boron and from 0.1 to 2.0% aluminum. These nickel-base sintered alloys provide a relatively wide range of sintering temperatures applicable in the manufacture thereof, and have furthermore a high sintered density of at least 95% of the theoretical value and are excellent in machinability, heat resistance, wear resistance and corrosion resistance.

Nickel-base sintered alloy

A cobalt-base sintered alloy which comprises: being manufactured from a reduced powder by the conventional powder metallurgy process with said reduced powder as a material powder, said reduced powder being prepared by simultaneously reducing a mixed powder consisting of powders of oxides of elements constituting said sintered alloy with a carbon powder added and mixed therein, and said reduced powder consisting of powders of said constituent elements and powders of carbides thereof; and consisting essentially of, in weight percentage: Chromium from 15.0 to 35.0% Tungsten from 3.0 to 19.0% Nickel from 0.2 to 12.0% Molybdenum from 0.1 to 15.0% Iron from 0.05 to 5.00% Titanium from 0.05 to 2.00% Silicon from 0.05 to 1.50% Manganese from 0.05 to 1.00% Carbon from 0.2 to 3.5% And The balance cobalt and incidental impurities. The above-mentioned cobalt-base sintered alloy, also containing, in weight percentage, from 0.05 to 1.00% boron. These cobalt-base sintered alloys provide a relatively wide range of sintering temperatures applicable in the manufacture thereof, and have furthermore a high sintered density of at least 95% of the theoretical value and are excellent in machinability, heat resistance, wear resistance and corrosion resistance.

Cobalt-base sintered alloy

A main raw material powder comprising cobalt oxide powder, chromium oxide powder and carbon powder is added with at least one metal oxide powder selected from the group consisting of manganese oxide powder, vanadium oxide powder, titanium oxide powder, tantalum oxide powder, niobium oxide powder, boron oxide powder, hafnium oxide powder, tungsten oxide powder, molybdenum oxide powder, iron oxide powder, nickel oxide powder and copper oxide powder; these powders are then mixed and pulverized to prepare a mixed powder; said mixed powder is then reduced by heating under vacuum or in a reducing atmosphere to obtain a reduced sponge-like mass; said sponge-like mass is finely pulverized, thereby manufacturing a cobalt-base reduced powder. A cobalt-base sintered alloy, produced by using said cobalt-base reduced powder thus manufactured as the material powder, has a relatively wide range of diffusion sintering temperatures applicable at the time of sintering thereof and has furthermore a high sintered density.

Process for manufacturing cobalt-base reduced powder

PURPOSE: To provide the title alloy contg. a specified amt. of C, Cr, Mo, W, V, Nb, Ta, etc., having a structure contg. uniformly dispersed carbide particles, and exhibiting superior wear resistance useful for the pad face, etc. of a valve rocker arm of an internal combustion engine. CONSTITUTION: The alloy contains C 1.0W3.0%, Cr 6.1W20.0% and one or more kinds of metals selected from Mo 0.5W10.0%, W 0.5W10.0%, V 0.2W0.5%, Nb 0.2W5.0% and Ta 0.2W5.0% (Cr+Mo+W+V+Nb+Ta≤20.0%). Ni 0.5W 10.0% and Co 0.5W10.0% may be contained. The alloy has a theoretical density ratio above 90% and a structure contg. uniformly dispersed carbide particles of 30W50μm. COPYRIGHT: (C)1980,JPO&Japio

Yuichi Saito

Papers

Nickel-base sintered alloy

Cobalt-base sintered alloy

Process for manufacturing cobalt-base reduced powder

Fe base sintered alloy with wear resistance

Wear resistant iron-base sintered alloy for rocker arm